How to use componentWillUnmount to pop up a confirmation box?

Question

JavaScript

For some elements, I want to make a confirmation popup when the user wants to leave it.
componentWillUnmount is perfect, but how do you undo and commit?
The idea is to display a modal with information and ask Yes / No there. If Yes, continue, if No, then cancel the transition. Tell me how.

Answer 1

No way. This method is created for cleanup in the component ( source ).
Use native browser methods for this.
// EDIT
If your component changes due to some event, it is logical that you need to warn the user in this handler, based on your conditions.